Catrineholm STW - Secondary Wastewater Treatment in Catrine, East Ayrshire, Scotland

Catrineholm STW is a wastewater treatment facility located in Catrine, East Ayrshire, Scotland, United Kingdom. The plant serves a population of approximately 2,421 people and is part of the municipal wastewater infrastructure for the local community. The plant provides secondary treatment, which is the standard biological treatment stage required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The designed capacity is 4,000 m³/day, and the current discharge volume is 539 m³/day, indicating operational capacity well within design limits. The treated effluent is discharged into the local water environment, ultimately draining into the River Ayr and then the Firth of Clyde. This water body supports diverse aquatic life and is an important ecological corridor in southwestern Scotland.

The plant discharges into the River Ayr catchment, which flows into the Firth of Clyde, a major sea inlet on Scotland's west coast. The Firth of Clyde supports important fisheries and marine habitats. The watershed is ecologically sensitive, with areas of conservation interest for salmon and other aquatic species.